Transparency holder for navigation aid

Details Transparency holder for navigation aid Transparency holder for navigation aid

1990-08-24

1994-08-23

Will, Thomas B.

Geometrical instruments

Miscellaneous

Light direction

33352, 353 11, 353DIG5, 359809, G01C 1702, G01C 2100

Patent

active

053395280

ABSTRACT:
A transparency holder for use in a navigation device is disclosed. The transparency holder is positioned between a lens and a compass, and is adapted to receive a map transparency in one correct orientation only. The one orientation only feature is achieved by providing certain asymmetric features, such as off-center notches which engage complementary features in the navigation device. In the preferred embodiment, the transparency holder has integral upper and lower halves hinged together by a living hinge and sandwiching the map transparency therebetween.

REFERENCES:
patent: 2210773 (1940-08-01), Niemeyer
patent: 3094781 (1963-06-01), Vangor
patent: 3242605 (1966-03-01), Kleinschmidt
patent: 3269261 (1966-08-01), Porter
patent: 3344707 (1967-10-01), Jullien-Davin
patent: 3983630 (1976-10-01), Hamm et al.
patent: 4335521 (1982-06-01), Rutherford
patent: 4422738 (1983-12-01), Steele

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